I don't think it's a coincidence that these are democratically dominated cities who heavily favor regulations. Portland in particular has been trying hard to wave or temporarily relax many of it's regulations in order to deliver more housing, but a more sustainable solution would be to permanently end some of the less useful regulations. The irony of the situation though is that the heavy regulations are part of the reason why these cities are so desirable because certain regulations make it a nicer city. It's hard to strike a balance on regulations.